UDF-fs: error (device loop6): udf_verify_fi: directory (ino 1408) has entry at pos 0 with incorrect tag ee6f ================================================================== BUG: KASAN: slab-out-of-bounds in crc_itu_t+0x1f5/0x280 lib/crc-itu-t.c:60 Read of size 1 at addr ffff88804e2a6100 by task syz-executor/4752 CPU: 0 PID: 4752 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 crc_itu_t+0x1f5/0x280 lib/crc-itu-t.c:60 udf_finalize_lvid fs/udf/super.c:2057 [inline] udf_sync_fs+0x194/0x350 fs/udf/super.c:2413 sync_filesystem+0xe6/0x220 fs/sync.c:56 generic_shutdown_super+0x6b/0x300 fs/super.c:448 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x61e/0x20a0 kernel/exit.c:883 do_group_exit+0x12e/0x300 kernel/exit.c:997 __do_sys_exit_group kernel/exit.c:1008 [inline] __se_sys_exit_group kernel/exit.c:1006 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5fce386749 Code: Unable to access opcode bytes at RIP 0x7f5fce38671f. RSP: 002b:00007ffc48ce81b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f5fce40adef RCX: 00007f5fce386749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000010 R08: 00007ffc48ce5f56 R09: 00007ffc48ce9470 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc48ce9470 R13: 00007f5fce40ad7d R14: 000055556dfe94a8 R15: 00007ffc48cea540 Allocated by task 5500: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] __proc_create+0x36c/0x8c0 fs/proc/generic.c:426 _proc_mkdir+0x5f/0x160 fs/proc/generic.c:490 proc_net_mkdir include/linux/proc_fs.h:214 [inline] afs_proc_init+0x68/0x1c0 fs/afs/proc.c:664 afs_net_init+0x783/0x990 fs/afs/main.c:116 ops_init+0x357/0x600 net/core/net_namespace.c:138 setup_net+0x38d/0x9f0 net/core/net_namespace.c:333 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:503 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x116/0x160 kernel/nsproxy.c:226 ksys_unshare+0x4bc/0x890 kernel/fork.c:3175 __do_sys_unshare kernel/fork.c:3249 [inline] __se_sys_unshare kernel/fork.c:3247 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3247 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88804e2a6000 which belongs to the cache proc_dir_entry of size 256 The buggy address is located 0 bytes to the right of 256-byte region [ffff88804e2a6000, ffff88804e2a6100) The buggy address belongs to the page: page:ffffea000138a980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e2a6 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff88801754a640 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5500, ts 97688723682, free_ts 97684703989 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x195/0x290 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] __proc_create+0x36c/0x8c0 fs/proc/generic.c:426 _proc_mkdir+0x5f/0x160 fs/proc/generic.c:490 proc_net_mkdir include/linux/proc_fs.h:214 [inline] afs_proc_init+0x68/0x1c0 fs/afs/proc.c:664 afs_net_init+0x783/0x990 fs/afs/main.c:116 ops_init+0x357/0x600 net/core/net_namespace.c:138 setup_net+0x38d/0x9f0 net/core/net_namespace.c:333 copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:503 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x116/0x160 kernel/nsproxy.c:226 ksys_unshare+0x4bc/0x890 kernel/fork.c:3175 __do_sys_unshare kernel/fork.c:3249 [inline] __se_sys_unshare kernel/fork.c:3247 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3247 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 tlb_batch_list_free mm/mmu_gather.c:61 [inline] tlb_finish_mmu+0x236/0x2e0 mm/mmu_gather.c:341 exit_mmap+0x3a6/0x5f0 mm/mmap.c:3218 __mmput+0x115/0x3b0 kernel/fork.c:1127 exit_mm+0x567/0x6c0 kernel/exit.c:550 do_exit+0x5a1/0x20a0 kernel/exit.c:870 do_group_exit+0x12e/0x300 kernel/exit.c:997 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88804e2a6000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e2a6080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804e2a6100: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff88804e2a6180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804e2a6200: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================